The following table shows the marks scored by 2 students in 5 different subjects.
| Student 1 | Student 2 | |
| Subject 1 | 40 | 30 |
| Subject 2 | 48 | 40 |
| Subject 3 | 36 | 35 |
| Subject 4 | 32 | 32 |
| Subject 5 | 44 | 43 |
N = Total marks of student 1 in subjects 1 and 4 taken together
M = Total marks of student 2 in subjects 3 and 5 taken together.
What is the value of N : M?